How strict do the rules need to be on a forum anyway? Pictures are not required even on eBay, nor should they be required here.
EDIT: And if you pay with PayPal, there is automatic buyer protection.
Fair enough on pictures, but requests for Paypal only as a gift or donation (which is not reversible if you end up with an A4000 box with a couple of cola bottles inside) needs to banned.
If you can't be trusted to use Paypal in the same way as ebay sellers are required to do so for people who can't collect then your thread should be locked and a MOD should message you to say payment methods open to fraud/abuse are not welcome on this family friendly forum.